One can buy, at considerable expense, a set of Imperial keycaps themed on Star Wars' galactic empire. Insert "you don't know the power of the Dark Side" joke here.
DSA Galactic Empire commemorates the peak of Emperor Palpatine's grand machinations with Imperial symbols and Aurebesh letters. Two keycap set variants are available. One features Full Aurebesh lettering and the other offers Aurebesh with English Sublegends.
BONUS: Here's a CNC-carved aluminum stormtroooper keycap to go with it.